I FIGURED IT OUT!
The solution was simple, using the Columns command written in this thread (above), only ONE thing was wrong… do NOT use the ".wpcf-form-item-checkbox" — instead just apply the columns to a div, then it works!
EXAMPLE:
(Where there is already a types-field called "location-zone" and a in the Views page we set up a URL parameter called "location")
The following will create 3 columns, each 200px wide with a 20px gap:
——————————————–
HTML:
<div class="box">
[wpv-control field="location-zone" auto_fill="wpcf-location-zone" auto_fill_default="All" type="checkboxes" url_param="location"]
</div>
CSS:
.box {
-moz-column-count: 3;
-moz-column-width:200px;
-moz-column-gap: 20px;
-webkit-column-count: 3;
-webkit-column-width: 200px;
-webkit-column-gap: 20px;
column-count: 3;
column-width: 200px;
column-gap: 20px;
}
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NOTE: Another idea I used was instead of a strict pixel width, I put "column-width:auto" which was more flexible.
HOPE THIS HELPS SOMEONE ELSE!